Routine Maintenance
See “ WARNING Hazardous
Voltage with Capacitors!” on page 49 regarding disconnection of power.
WARNING Hazardous Chemicals!
Coil cleaning agents can be either acidic or highly alkaline. Handle chemical carefully. Proper handling should include goggles or face shield, chemical resistant gloves, boots, apron or suit as required. For personal safety refer to the cleaning agent manufacturer’s Materials Safety Data Sheet and follow all recommended safe handling practices. Failure to follow all safety instructions could result in death or serious injury.
Internal Insulation
The process of cooling and dehumidification produces condensate that must be continuously removed from the air- handling unit. The section of the unit from the entering air side of the cooling coil to the leaving edge of the drain pan is considered to be the “wet” section of the unit. Other potentially “wet” sections are immediately downstream of a humidifier and/or an outside air intake section.
Internal insulation in areas of the unit that are normally considered to be “dry” must also be periodically inspected to assure the insulation is clean and dry. Wet insulation in an area that is normally considered to be “dry” can indicate an operational problem (refer to the “Troubleshooting” section on page 56 for further information). The equipment should be inspected a minimum of every six months or more frequently as operating experience dictates.
Accumulated dirt and other organic matter exposed to water or extended periods of high relative humidity
(60 percent or higher) can support microbial growth, which must be removed to prevent the unit from becoming a contaminant source.
If evidence of contamination exists in either the wet or dry sections:
•Determine and eliminate the cause.
•Remove the contamination.
•Sanitize the affected area.
See the “Troubleshooting” section on page 56 for assistance in identifying the cause.
If microbial growth on a
1Disconnect all electrical power to the unit.
2Wearing the appropriate personal protective equipment, use a brush for sheet metal surfaces or a soft sponge on a foil face or closed cell foam surface to mechanically remove the microbial growth.
Note: Be careful not to damage the
3Install a
4Thoroughly clean all areas with an
5Rinse the affected surfaces thoroughly with fresh water and a fresh sponge to prevent potential corrosion of the drain pan and drain line.
6Repeat steps 4 and 5 as necessary.
7Confirm the drain line is open following the cleaning process.
8Allow the unit to dry thoroughly before putting it back into service.
9Replace all panels and parts and restore electrical power to the unit.
10Be careful that any contaminated material does not contact other areas of the unit or building. Properly dispose of all contaminated materials and cleaning solution.
To clean a porous insulating surface (fiberglass insulation):
1Disconnect all electrical power to the unit.
2Wearing the appropriate personal protective equipment, use a vacuum device with a HEPA filter (99.97 percent efficient at 0.3 micron particles) to remove the accumulated dirt and organic matter.
Note: Be careful not to tear the insulation surface or edges.
3Confirm the drain line is open following the cleaning process.
4Allow the unit to dry thoroughly before putting it back into service.
5Replace all panels and parts and restore electrical power to the unit.
6Be careful that any contaminated material does not contact other areas of the unit or building. Properly dispose of all contaminated materials and cleaning solution.
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